What If? X-Men Age of Apocalypse

Like any other What If? story, this one begins with a very simple question: What if Legion had killed Professor Xavier and Magneto? In the world that follows, Earth is without positive example of mutants the X-Men provide, and many countries force mutants into concentration camps. Fueled by indignation, a powerful mutant named Apocalypse rises up and destroys humanity. Now, years after the slaughter, a few resistance fighters attempt a mission that will allow them to go back in time and stop the crimes that led up to the devastation of Earth.